×

Indicator ink compositions

  • US 5,990,199 A
  • Filed: 04/19/1995
  • Issued: 11/23/1999
  • Est. Priority Date: 04/19/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. An indicator ink comprising a dispersion of phenol-formaldehyde resin in water, at least one colorant and between about 0.5% to about 13% of the total weight of the composition a polyamide curing agent with an amine value between about 100 to about 400.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×